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NEWS
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Noteworthy changes in release ?.?? (????-??-??)
===============================================
* Improvements
* Updated decoding of listmount, statmount, and statx syscalls.
* Updated lists of ETHTOOL_*, IORING_*, IPPROTO_*, RWF_*, STATX_*, and V4L2_*
constants.
Noteworthy changes in release 6.10 (2024-07-21)
===============================================
* Improvements
* Implemented --decode-fds=eventfd option to retrieve eventfd object details
associated with eventfd file descriptors.
* Implemented decoding of NETLINK_GENERIC nlctrl protocol.
* Implemented decoding of F_DUPFD_QUERY fcntl.
* Implemented decoding of mseal syscall.
* Updated decoding of statx and prctl syscalls.
* Updated decoding of BPF_RAW_TRACEPOINT_OPEN bpf command.
* Updated lists of BPF_*, IORING_*, KEXEC_*, KEY_*, LANDLOCK_*, PR_*, STATX_*,
TCP_*, TEE_*, V4L2_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 6.10.
* Bug fixes
* Worked around a bug introduced in Linux 6.5 that affected system call
tampering on riscv64.
Noteworthy changes in release 6.9 (2024-05-14)
==============================================
* Improvements
* Implemented --always-show-pid option.
* The --user|-u option has learned to recognize numeric UID:GID pair, allowing
e.g. statically-built strace to be used without invoking nss plugins.
* Implemented decoding of IORING_REGISTER_SYNC_CANCEL,
IORING_REGISTER_FILE_ALLOC_RANGE, IORING_REGISTER_PBUF_STATUS,
IORING_REGISTER_NAPI, and IORING_UNREGISTER_NAPI opcodes of
io_uring_register syscall.
* Implemented decoding of BPF_TOKEN_CREATE bpf syscall command.
* Updated decoding of io_uring_register and pidfd_send_signal syscalls.
* Updated lists of BPF_*, CAN_*, IORING_*, KEY_*, LSM_*, MPOL_*, NT_*, RWF_*,
PIDFD_*, PTP_*, TCP_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 6.9.
Noteworthy changes in release 6.8 (2024-03-20)
==============================================
* Improvements
* Renamed --stack-traces to --stack-trace for consistency.
Old option is retained for backwards compatibility.
* Implemented --stack-trace-frame-limit=N option for configuring the limit
of the number of printed backtrace frames.
* Implemented decoding of statmount, listmount, lsm_get_self_attr,
lsm_set_self_attr, and lsm_list_modules syscalls.
* Implemented decoding of setsockopt(TCP_AO_ADD_KEY).
* Updated decoding of landlock_create_ruleset and landlock_add_rule syscalls.
* Updated decoding of SMC_DIAG_DMBINFO netlink attribute.
* Updated decoding of UBI_IOCATT ioctl command.
* Enhanced decoding of mount attributes of fsmount and mount_setattr syscalls.
* Updated lists of BPF_*, KEXEC_*, KVM_*, PERF_*, SOL_*, STATX_*, UFFD_*,
and V4L2_* constants.
* Updated lists of ioctl commands from Linux 6.8.
Noteworthy changes in release 6.7 (2024-01-29)
==============================================
* Improvements
* Implemented -kk/--stack-traces=source option for libdw-based stack tracing.
* Implemented decoding of futex_wake, futex_wait, and sys_futex_requeue
syscalls.
* Updated lists of BPF_*, BTRFS_*, IORING_*, KVM_*, LANDLOCK_*, PR_*,
and TCP_* constants.
* Updated lists of ioctl commands from Linux 6.7.
* Bug fixes
* Fix strace -r during the first second after booting to show correct relative
timestamps.
* Fix strace -f entering deadlock on exit if there are tracee processes
spawned using vfork semantics.
Noteworthy changes in release 6.6 (2023-10-31)
==============================================
* Improvements
* Implemented --kill-on-exit option that instructs the tracer to set
PTRACE_O_EXITKILL option to all tracee processes and not to detach them
on cleanup so they will not be left running after the tracer exit.
* Implemented automatic activation of --kill-on-exit option when
--seccomp-bpf is enabled and -p/--attach option is not used.
* Implemented decoding of map_shadow_stack syscall.
* Implemented decoding of FSCONFIG_CMD_CREATE_EXCL fsconfig command.
* Implemented decoding of IFLA_BRPORT_BACKUP_NHID netlink attribute.
* Implemented decoding of SECCOMP_IOCTL_NOTIF_SET_FLAGS ioctl.
* Implemented decoding of UFFDIO_CONTINUE, UFFDIO_POISON, and
UFFDIO_WRITEPROTECT ioctls.
* Updated lists of ARCH_*, BPF_*, DEVCONF_*, IORING_*, KEXEC_*, MAP_*, NT_*,
PTRACE_*, QFMT_*, SEGV_*, UFFD_*, V4L2_*, and XDP_* constants.
* Updated lists of ioctl commands from Linux 6.6.
Noteworthy changes in release 6.5 (2023-09-01)
==============================================
* Improvements
* Implemented decoding of cachestat and fchmodat2 syscalls.
* Implemented decoding of SO_PASSPIDFD and SO_PEERPIDFD socket options.
* Implemented decoding of SCM_PIDFD control messages.
* Implemented decoding of BPF_ENABLE_STATS, BPF_ITER_CREATE, BPF_LINK_DETACH,
and BPF_PROG_BIND_MAP bpf syscall commands.
* Updated decoding of BPF_OBJ_PIN and BPF_OBJ_GET bpf syscall commands.
* Updated lists of AT_*, BPF_*, IORING_*, KVM_*, MOVE_MOUNT_*, NFT_*, NT_*,
PR_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 6.5.
Noteworthy changes in release 6.4 (2023-06-26)
==============================================
* Improvements
* Implemented decoding of IFLA_BRPORT_NEIGH_VLAN_SUPPRESS netlink attribute.
* Implemented decoding of IP_PROTOCOL type control messages and socket option.
* Updated lists of BPF_*, IP_*, KVM_*, MDBA_*, PACKET_*, PR_*, PTRACE_*,
UFFD_*, and V4L2_PIX_FMT_* constants.
* Updated lists of ioctl commands from Linux 6.4.
* Bug fixes
* Turn --seccomp-bpf off when --syscall-limit option is specified.
* Fixed --trace-fds filtering support of syscalls taking file descriptor
arguments that do not normally have a path associated with them.
Noteworthy changes in release 6.3 (2023-05-08)
==============================================
* Improvements
* Implemented --trace-fds=set option for filtering only the syscalls
that operate on the specified set of file descriptors.
* Implemented --decode-fds=signalfd option for decoding of signal masks
associated with signalfd file descriptors.
* Implemented --syscall-limit option to automatically detach tracees
after capturing the specified number of syscalls.
* Implemented --argv0 option to set argv[0] of the command being executed.
* Implemented decoding of PR_GET_MDWE and PR_SET_MDWE operations of prctl
syscall.
* Implemented decoding of IP_LOCAL_PORT_RANGE socket option.
* Implemented decoding of IFLA_BRPORT_MCAST_N_GROUPS,
IFLA_BRPORT_MCAST_MAX_GROUPS, IFLA_GSO_IPV4_MAX_SIZE,
IFLA_GRO_IPV4_MAX_SIZE, and TCA_EXT_WARN_MSG netlink attributes.
* Updated lists of F_SEAL_*, IFLA_*, IORING_*, MFD_*, NFT_*, TCA_*,
and V4L2_PIX_FMT_* constants.
* Updated lists of ioctl commands from Linux 6.3.
* Bug fixes
* Fixed build on hppa with uapi headers from Linux >= 6.2.
* Fixed --status filtering when -c option is in use.
Noteworthy changes in release 6.2 (2023-02-26)
==============================================
* Improvements
* Implemented collision resolution for overlapping ioctl commands
from tty and snd subsystems.
* Implemented decoding of IFLA_BRPORT_MAB and IFLA_DEVLINK_PORT
netlink attributes.
* Updated lists of ALG_*, BPF_*, IFLA_*, KEY_*, KVM_*, LANDLOCK_*,
MEMBARRIER_*, NFT_*, NTF_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 6.2.
* Bug fixes
* Fixed build on alpha architecture.
Noteworthy changes in release 6.1 (2022-12-12)
==============================================
* Improvements
* Enhanced decoding of terminal ioctl commands.
* Updated decoding of statx syscall.
* Updated lists of ABS_*, BPF_*, BTRFS_*, COUNTER_*, ETH_P_*, IFLA_*,
KVM_*, MADV_*, NLMSGERR_*, PERF_*, STATX_*, and TLS_* constants.
* Updated lists of ioctl commands from Linux 6.1.
* Bug fixes
* Fixed injection tests on ia64.
Noteworthy changes in release 6.0 (2022-10-29)
==============================================
* Improvements
* Enhanced decoding of PTP_* ioctl commands.
* Updated decoding of setns syscall.
* Updated lists of BPF_*, BTRFS_*, FAN_*, ETH_P_*, KVM_*, NDTPA_*,
NT_*, PERF_*, and TLS_INFO_* constants.
* Updated lists of ioctl commands from Linux 6.0.
Noteworthy changes in release 5.19 (2022-08-12)
===============================================
* Changes in behaviour
* The "(deleted)" marker for unlinked paths of file descriptors is now printed
outside angle brackets; the matching of unlinked paths of file descriptors
no longer includes the " (deleted)" part into consideration.
* Improvements
* Implemented printing of Unix socket sun_path field's SELinux context.
* Implemented decoding of SO_TXREHASH socket option.
* Implemented decoding of IFLA_TSO_MAX_SIZE, IFLA_TSO_MAX_SEGS,
NDA_FDB_EXT_ATTRS, NDA_FLAGS_EXT, NDA_NDM_FLAGS_MASK,
and NDA_NDM_STATE_MASK netlink attributes.
* Improved decoding of INET_DIAG_LOCALS, INET_DIAG_MD5SIG, INET_DIAG_PEERS,
INET_DIAG_PROTOCOL, INET_DIAG_REQ_PROTOCOL, INET_DIAG_SHUTDOWN,
INET_DIAG_SK_BPF_STORAGES, INET_DIAG_SOCKOPT, and INET_DIAG_ULP_INFO
NETLINK_SOCK_DIAG netlink attributes.
* Enhanced decoding of arch_prctl and prctl syscalls.
* Enhanced siginfo_t decoding.
* Updated decoding of struct rtnl_link_stats64.
* Updated lists of DEVCONF_*, FAN_MARK_*, GPIO_V2_LINE_FLAG_*, IORING_*,
KEXEC_*, LANDLOCK_*, NET_IPV4_CONF_*, NLM_F_*, NT_*, PR_*, SECCOMP_*,
UFFD_FEATURE_*, V4L2_CID_*, and V4L2_PIX_FMT_* constants.
* Updated lists of ioctl commands from Linux 5.19.
Noteworthy changes in release 5.18 (2022-06-18)
===============================================
* Improvements
* Added an interface of raising des Strausses awareness.
* Added --tips option to print strace tips, tricks, and tweaks
at the end of the tracing session.
* Enhanced decoding of bpf and io_uring_register syscalls.
* Implemented decoding of COUNTER_*, RTC_PARAM_GET, and RTC_PARAM_SET ioctl
commands.
* Updated lists of BPF_*, BR_*, BTRFS_*, IFA_*, IFLA_*, IORING_*, KEY_*,
KVM_*, MADV_*, and UFFD_* constants.
* Updated lists of ioctl commands from Linux 5.18.
* Bug fixes
* Fixed printing of the updated value of union bpf_attr.next_id
on the exiting of bpf(BPF_*_GET_NEXT_ID) calls.
Noteworthy changes in release 5.17 (2022-03-26)
===============================================
* Improvements
* Added 64-bit LoongArch architecture support.
* Extended personality designation syntax of syscall specification expressions
to support all@pers and %class@pers.
* Enhanced rejection of invalid syscall numbers in syscall specification
expressions.
* Implemented decoding of set_mempolicy_home_node syscall, introduced
in Linux 5.17.
* Implemented decoding of IFLA_GRO_MAX_SIZE and TCA_ACT_IN_HW_COUNT netlink
attributes.
* Implemented decoding of PR_SET_VMA operation of prctl syscall.
* Implemented decoding of siginfo_t.si_pkey field.
* Implemented decoding of LIRC ioctl commands.
* Updated lists of FAN_*, IORING_*, IOSQE_*, KEY_*, KVM_*, MODULE_INIT_*,
TCA_ACT_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 5.17.
Noteworthy changes in release 5.16 (2022-01-10)
===============================================
* Improvements
* Implemented --secontext=mismatch option to find mismatches in SELinux
contexts.
* Implemented decoding of futex_waitv syscall introduced in Linux 5.16.
* Implemented decoding of BPF_LINK_GET_NEXT_ID and BPF_LINK_GET_FD_BY_ID bpf
syscall commands.
* Enhanced decoding of BPF_MAP_CREATE, BPF_PROG_TEST_RUN, and BPF_PROG_LOAD
bpf syscall commands.
* Enhanced decoding of BTRFS_IOC_FS_INFO ioctl command.
* Updated lists of AUDIT_*, BPF_*, BTRFS_*, DEVCONF_*, FAN_*, ETH_P_*,
IPV4_DEVCONF_*, KVM_*, NDA_*, SO_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.16.
* Bug fixes
* Fixed build for older Android.
Noteworthy changes in release 5.15 (2021-12-01)
===============================================
* Improvements
* Implemented --strings-in-hex=non-ascii-chars option for using hexadecimal
numbers instead of octal ones in escape sequences in the output strings.
* Implemented --decode-pids=comm option (and its alias -Y) for printing
command names for PIDs.
* Implemented --decode-pids=pidns as an alias to --pidns-translation option.
* Implemented printing of current working directory when AT_FDCWD constant
is used with --decode-fds=path option enabled.
* Improved printing of syscall names in places where the associated
AUDIT_ARCH_* value is present (ptrace PTRACE_GET_SYSCALL_INFO request,
SIGSYS siginfo_t).
* Implemented decoding of process_mrelease syscall, introduced in Linux 5.15.
* Implemented decoding of SECCOMP_GET_NOTIF_SIZES operation of seccomp
syscall.
* Implemented decoding of HDIO_*, KD*, and SECCOMP_* ioctl commands.
* Implemented decoding of RTM_NEWCACHEREPORT, RTM_{NEW,DEL,GET}NEXTHOP,
and RTM_{NEW,GET}STATS NETLINK_ROUTE netlink messages.
* Implemented decoding of AF_ALG, AF_IEEE802154, AF_MCTP, AF_NFC, AF_QIPCRTR,
AF_RRPC, AF_VSOCK, and AF_XDP socket addresses.
* Implemented decoding of AF_BRIDGE and AF_MCTP protocols for IFLA_AF_SPEC
netlink attribute.
* Implemented decoding of IFLA_BR_MCAST_QUERIER_STATE, IFLA_BR_MULTI_BOOLOPT,
IFLA_INET6_RA_MTU, IFLA_INFO_SLAVE_DATA, and IFLA_VFINFO_LIST netlink
attributes.
* Enhanced decoding of io_uring_register and times syscalls.
* Enhanced IFLA_BR_FORWARD_DELAY, IFLA_BR_MAX_AGE, IFLA_EXT_MASK,
IFLA_PROTINFO, *_INTVL, and *_TIMER netlink attribute decoding.
* Enhanced decoding of AF_IPX and AF_NETLINK socket addresses.
* Updated lists o AF_*, ARPHRD_*, BTRFS_*, DEVCONF_*, DM_*, ETH_P_*,
FAN_REPORT_*, IORING_*, MOVE_MOUNT_*, MPOL_*, PACKET_*, RTM_*, SO_*,
and XFRM_MSG_* constants.
* Updated lists of ioctl commands from Linux 5.15.
* Bug fixes
* Fixed printing of struct bpf_prog_info.map_ids array.
* Fixed behaviour of "dev", "pidfd", and "socket" arguments of the --print-fds
option to no longer imply the "path" argument.
* Fixed insufficient buffer size used for network interface name printing,
that previously led to assertions on attempts of printing interface names
that require quoting, for example, names longer than 4 characters in -xx
mode (addresses RHBZ bug #2028146).
Noteworthy changes in release 5.14 (2021-09-02)
===============================================
* Improvements
* Implemented decoding of memfd_secret and quotactl_fd syscalls,
introduced in Linux 5.14.
* Enhanced prctl syscall decoding.
* Enhanced decoding of IFLA_* netlink attributes.
* Enhanced decoding of MDBA_ROUTER_PATTR_* mdb router port netlink attributes.
* Updated lists of BPF_*, IORING_*, MADV_*, MOUNT_ATTR_*, SCTP_*,
and UFFD_* constants.
* Updated lists of ioctl commands from Linux 5.14.
* Bug fixes
* Fixed build using bionic libc.
Noteworthy changes in release 5.13 (2021-07-18)
===============================================
* Improvements
* Print netlink data in a more structured way.
* Implemented decoding of NT_PRSTATUS and NT_FPREGSET regsets
of PTRACE_GETREGSET and PTRACE_SETREGSET requests.
* Implemented decoding of regs argument of PTRACE_GETREGS, PTRACE_GETREGS64,
PTRACE_SETREGS, PTRACE_SETREGS64, PTRACE_GETFPREGS, and PTRACE_SETFPREGS
requests.
* Implemented powerpc System Call Vectored ABI support.
* Implemented decoding of landlock_add_rule, landlock_create_ruleset,
and landlock_restrict_self syscalls introduced in Linux 5.13.
* Enhanced decoding of perf_event_open syscall.
* Updated lists of BPF_*, IORING_*, KEXEC_*, KEY_*, KVM_*, NT_*, PR_*,
PTRACE_*, RTM_*, RTPROT_*, TRAP_*, UFFD_*, UFFDIO_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.13.
* Portability
* On powerpc and powerpc64, linux kernel >= 2.6.23 is required.
Older versions without a decent PTRACE_GETREGS support will not work.
Noteworthy changes in release 5.12 (2021-04-26)
===============================================
* Improvements
* Implemented --secontext[=full] option to display SELinux contexts.
* Implemented decoding of mount_setattr syscall introduced in Linux 5.12.
* Updated decoding of IFLA_BRPORT_* netlink attributes to match Linux 5.12.
* Updated lists of DEVCONF_*, IORING_*, KVM_*, MPOL_*, MTD_*, NFT_MSG_*,
RESOLVE_*, RTM_*, ST_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.12.
* Bug fixes
* Fixed build using bionic libc.
* Portability
* Added binutils 2.36 support to --enable-mpers builds.
Noteworthy changes in release 5.11 (2021-02-17)
===============================================
* Improvements
* Implemented poke injection (--inject=SET:poke_enter= and
--inject=SET:poke_exit= options).
* Implemented decoding of epoll_pwait2 syscall introduced in Linux 5.11.
* Implemented decoding of GPIO_* ioctl commands.
* Implemented decoding of FS_IOC_FS[GS]ETXATTR, FS_IOC_[GS]ETFLAGS,
and FS_IOC32_[GS]ETFLAGS ioctl commands.
* Implemented decoding of SIOCADDMULTI, SIOCDELMULTI, SIOCGIFENCAP,
SIOCOUTQNSD, SIOCSIFENCAP, and SIOCSIFHWBROADCAST ioctl commands.
* Implemented decoding of UBI_IOCRPEB and UBI_IOCSPEB ioctl commands.
* Implemented decoding of V4L2_BUF_TYPE_META_CAPTURE,
V4L2_BUF_TYPE_META_OUTPUT, and VIDIOC_QUERY_EXT_CTRL ioctl commands.
* Updated lists of BPF_*, BTRFS_*, CLOSE_RANGE_*, ETH_*, IORING_*, KVM_*,
PR_*, PTRACE_*, RTA_*, RTAX_*, RTM_*, RTNH_*, SCTP_*, SO_*, SYS_*, UFFD_*,
and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.11.
* Bug fixes
* Fixed decoding of SIOCGIFINDEX, SIOCBRADDIF, and SIOCBRDELIF ioctl commands.
* Fixed decoding of FIO[GS]ETOWN, SIOC[GS]PGRP, and SIOCATMARK ioctl commands
on alpha, mips, sh, and xtensa architectures.
* Fixed fork--pidns-translation test on sparc and sparc64.
* Fixed build on hppa with uapi headers from Linux >= 5.10.
Noteworthy changes in release 5.10 (2020-12-14)
===============================================
* Improvements
* libdw-based stack tracing is now enabled for non-native personalities.
* Implemented decoding of process_madvise syscall introduced in Linux 5.10.
* Updated decoding of pidfd_open syscall to match Linux 5.10.
* Updated decoding of membarrier syscall to match Linux 5.10.
* Updated lists of ALG_*, BPF_*, INET_DIAG_*, IORING_*, KEY_*, KVM_*, MDBA_*,
MEMBARRIER_CMD_*, MS_*, NLMSGERR_*, NT_*, STATX_*, SEGV_*, and V4L2_*
constants.
* Updated lists of ioctl commands from Linux 5.10.
* Bug fixes
* Added clock_gettime64, clock_settime64, clock_adjtime64, and
lock_getres_time64 syscalls to %clock trace class.
* Portability
* Implemented workarounds for -Wall regressions in Red Hat gcc 11.0.0-0.
Noteworthy changes in release 5.9 (2020-09-24)
==============================================
* Improvements
* Added -n/--syscall-number option for printing syscall numbers.
* Added --pidns-translation option for PID namespace translation (addresses
Fedora bug #1035433).
* Implemented decoding of close_range syscall.
* Implemented decoding of TEE_* ioctl commands.
* Implemented decoding of struct msginfo argument of IPC_INFO
and MSG_INFO msgctl syscall commands.
* Implemented decoding of struct msqid_ds argument of MSG_STAT
and MSG_STAT_ANY msgctl syscall commands.
* Implemented decoding of struct seminfo argument of IPC_INFO
and SEM_INFO semctl syscall commands.
* Implemented decoding of struct semid_ds argument of IPC_SET,
IPC_STAT, SEM_STAT, and SEM_STAT_ANY semctl syscall commands.
* Implemented decoding of struct shminfo argument of IPC_INFO
shmctl syscall command.
* Implemented decoding of struct shm_info argument of SHM_INFO
shmctl syscall command.
* Implemented decoding of struct shmid_ds argument of SHM_STAT
and SHM_STAT_ANY shmctl syscall commands.
* Updated lists of BPF_*, CAP_*, FAN_*, IFLA_*, INET_DIAG_REQ_*,
IORING_FEAT_*, IP_*, IPV6_*, KVM_*, NDA_*, PTP_PEROUT_*, RTPROT_*,
and V4L2_FMT_FLAG_* constants.
* Updated lists of ioctl commands from Linux 5.9.
Noteworthy changes in release 5.8 (2020-08-06)
==============================================
* Changes in behaviour
* Modified %process class to contain system calls associated with
process lifecycle (creation, exec, termination):
kill, tkill, tgkill, pidfd_send_signal and rt_sigqueueinfo are added,
arch_prctl and unshare are removed.
* Improvements
* Implemented decoding of faccessat2 syscall.
* Implemented decoding of LOOP_CONFIGURE ioctl command.
* Updated decoding of io_uring_setup syscall to match Linux 5.8.
* Updated lists of AUDIT_*, BPF_*, CAP_*, ETH_*, INET_DIAG_*, IORING_*,
KEYCTL_*, KVM_*, LOOP_*, NDA_*, RTC_*, TCA_*, STATX_*, and *_MAGIC
constants.
* Updated lists of ioctl commands from Linux 5.8.
* Bug fixes
* Added statx syscall to %fstat trace class.
Noteworthy changes in release 5.7 (2020-06-01)
==============================================
* Improvements
* Implemented interval specification in "when=" subexpression of syscall
tampering expressions.
* Added -e trace=%clock option for tracing syscalls reading or modifying
system clocks.
* Implemented decoding of BPF_LINK_CREATE and BPF_LINK_UPDATE bpf
syscall commands.
* Updated decoding of clone3 syscall to match Linux 5.7.
* Updated lists of BPF_*, BTRFS_*, CLONE_*, FAN_*, IORING_*, KVM_*,
LWTUNNEL_*, MREMAP_*, PERF_*, SECCOMP_*, UFFDIO_*, V4L2_*, and XDP_*
constants.
* Updated lists of ioctl commands from Linux 5.7.
* Bug fixes
* Fixed decoding of getdents and getdents64 syscalls when they return
a lot of directory entries.
* Fixed pathtrace matching of openat2 syscall.
* Fixed build on systems without fork.
Noteworthy changes in release 5.6 (2020-04-07)
==============================================
* Changes in behaviour
* Messages about unknown tracees are now subject to the strace's quietness
setting (-q/--quiet).
* If -A option is provided without -o, or -S option without -c/-C, a warning
about its uselessness is printed now.
* The usage of --seccomp-bpf without -f has no effect now.
* Improvements
* Every short option now has a long option alias, which also has enabled
the following improvements:
* Ability to use human-readable settings for -I/--interruptible,
-D/--daemonize options.
* Ability to silence specific messages using -e quiet/--quiet qualifier
(an alias for the -q option), including those that couldn't be silenced
previously (path resolution messages and "superseded by execve").
* Ability to specify selected fd decoding features using
-e decode-fds/--decode-fds qualifier (an alias for the -y option).
* Ability to set precision for the absolute timestamp, relative timestamp,
and syscall time output (using --absolute-timestamps,
--relative-timestamps, and --syscall-times options, respectively).
* Implemented ability to select the set of displayed columns in the call
summary output (-U/--summary-columns option).
* Implemented ability to sort on any summary column.
* Implemented ability to show information about minimum and maximum call
duration in the call summary output (addresses Debian bug #240945).
* Implemented printing of PIDs associated with pidfds in -yy mode.
* Implemented PTRACE_GETREGS API support on hppa, sh, sh64, and xtensa.
* Improved performance of libdw-based stack traces printing by implementing
a symbol-to-address cache.
* Implemented decoding of openat2 and pidfd_getfd syscalls.
* Enhanced io_uring_register, prctl, sched_getattr, and sched_setattr syscall
decoding.
* Implemented decoding of BPF_MAP_LOOKUP_BATCH,
BPF_MAP_LOOKUP_AND_DELETE_BATCH, BPF_MAP_UPDATE_BATCH, and
BPF_MAP_DELETE_BATCH bpf syscall commands.
* Enhanced decoding of BPF_MAP_CREATE and BPF_PROG_ATTACH bpf syscall
commands.
* Enhanced decoding of RTC_VL_READ ioctl command.
* Enhanced decoding of IFLA_* netlink attributes.
* Implemented HIDIOCGRAWUNIQ() ioctl command number printing.
* Wired up kexec_file_load syscall on hppa.
* Updated lists of AUDIT_*, BPF_*, CLONE_*, GRND_*, IFLA_*, IORING_*,
IPPROTO_*, KEY_*, KVM_*, RTM_F_*, SCHED_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 5.6.
* Bug fixes
* Fixed build on csky abiv1 architecture.
* Various minor fixes in VIDIOC_* ioctl output formatting.
* Fix printing of the size field for _IOC_NONE ioctl command numbers on sparc.
* Portability
* On hppa, linux kernel >= 4.7 is required.
On sh and sh64, linux kernel >= 2.6.28 is required.
Older versions without a decent PTRACE_GETREGS support will not work.
Noteworthy changes in release 5.5 (2020-02-06)
==============================================
* Improvements
* Added -e trace=%creds option for tracing syscalls related to process
credentials.
* Enhanced decoding of arch_prctl, keyctl, io_uring_register, io_uring_setup,
and perf_event_open syscalls.
* Enhanced decoding of BPF_PROG_LOAD bpf syscall command.
* Updated decoding of clone3 syscall to match Linux 5.5.
* Implemented decoding of TCA_ACT_FLAGS and TCA_STATS_PKT64 netlink
attributes.
* Updated lists of AUDIT_*, BPF_*, CLONE_*, KEY_*, KVM_*, PPC_PTRACE_*,
SCTP_*, STATX_*, TIPC_*, V4L2_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 5.5.
* Enhanced manual page and "strace --help" output.
* Bug fixes
* Fixed stack trace printing for early syscalls when strace is configured
to use libdw backend for stack tracing (addresses Fedora bug #1788636).
* Fixed stack trace caching when --seccomp-bpf option is specified.
* Fixed potentially unaligned access in decoder of SO_TIMESTAMP*_NEW
control messages.
* Fixed decoding of NDA_LLADDR netlink neighbor table attribute.
* Fixed build of mpers support when CFLAGS contains -flto.
* Fixed build on no-MMU architectures.
* Fixed build with glibc-2.31 and Linux kernel headers < 5.3.
* Fixed tests for glibc-2.31.
Noteworthy changes in release 5.4 (2019-11-28)
==============================================
* Improvements
* Implemented -DD and -DDD options that move strace into a separate
process group and session, respectively.
* Enhanced seccomp-bpf tracee syscall filtering support by implementing
new "binary match" BPF program generation strategy and automatically
choosing the strategy that generates the shortest BPF program.
* Implemented decoding of BPF_BTF_GET_NEXT_ID bpf syscall command.
* Enhanced decoding of BPF_MAP_LOOKUP_ELEM bpf syscall command.
* Implemented PTP_CLOCK_GETCAPS2, PTP_EXTTS_REQUEST2, PTP_PEROUT_REQUEST2,
PTP_ENABLE_PPS2, and PTP_SYS_OFFSET2 ioctl decoding.
* Updated lists of BPF_*, CAN_*, KEXEC_*, KVM_*, MADV_*, MSG_*, P_*, PR_*,
PTP_*, SCTP_*, and V4L2_* constants.
* Implemented ability to build ARM EABI mpers support using a separate
compiler on aarch64.
* Updated lists of ioctl commands from Linux 5.4.
* Enhanced manual page.
* Bug fixes
* Fixed -b execve when --seccomp-bpf option is specified.
* Fixed decoding of BPF_PROG_LOAD bpf syscall command.
* Fixed build on no-MMU architectures.
* Fixed build on antique systems that do not provide necessary definitions
of AUDIT_ARCH_* constants.
Noteworthy changes in release 5.3 (2019-09-25)
==============================================
* Improvements
* Implemented usage of seccomp-bpf for stopping tracees only for filtered
syscalls. Use --seccomp-bpf option to enable.
* Implemented decoding of pidfd_open and clone3 syscalls.
* Enhanced decoding of io_cancel, io_submit, s390_sthyi, and syslog syscalls.
* Enhanced decoding of NETLINK_ROUTE protocol.
* Implemented decoding of UNIX_DIAG_UID netlink attribute.
* Implemented decoding of WDIOC_* ioctl commands.
* Enhanced syscall count statistics: overhead is now applied per-call,
added ability for sorting on errors field.
* Syscall delay injection and overhead values can now be supplied with
time measure unit suffix and provided in IEEE 754 floating point format.
* Updated lists of AUDIT_*, BPF_*, ETH_*, KEYCTL_*, KVM_*, MAP_*, SO_*, TCP_*, V4L2_*,
XDP_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 5.3.
* Enhanced manual page.
* Bug fixes
* Fixed syscall tampering on arc, avr32, csky, ia64, m68k, metag, mips,
nios2, or1k, riscv, s390, s390x, sparc, sparc64, and tile architectures
when PTRACE_GET_SYSCALL_INFO is in use.
* Fixed decoding of sockaddr_hci (AF_BLUETOOTH) addresses that lack
hci_channel field.
* Fixed evdev ioctl bitset decoding.
* Fixed tests on alpha with Linux kernel headers 5.1+.
* Portability
* Removed support for decoding syscalls in range [1024...1079] on AArch64
architecture as this range has never been implemented in mainline kernel
releases.
Noteworthy changes in release 5.2 (2019-07-12)
==============================================
* Improvements
* Implemented syscall return status filtering with -e status=set option
and its aliases: -z (limit syscall printing to successful syscalls only)
and -Z (limit syscall printing to failed syscalls only). Addresses Debian
bug #176376.
* Implemented decoding of open_tree, move_mount, fsopen, fsconfig, fsmount,
and fspick syscalls.
* Enhanced decoding of bpf, clone, inotify_init, mbind, and set_mempolicy
syscalls.
* Updated lists of AT_*, AUDIT_*, BPF_*, CLONE_*, ETH_*, KEY_*, KVM_*, MPOL_*,
TIPC_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.2.
* Bug fixes
* Fixed syscall tampering on powerpc and powerpc64 when
PTRACE_GET_SYSCALL_INFO is in use.
* Fixed build with cutting-edge toolchain.
Noteworthy changes in release 5.1 (2019-05-22)
==============================================
* Bug fixes
* Fixed decoding of last two arguments of clone syscall on riscv.
* Improvements
* Added C-SKY architecture support.
* Implemented decoding of SO_TIMESTAMP*_NEW control messages.
* Implemented decoding of clock_gettime64, clock_settime64, clock_adjtime64,
clock_getres_time64, clock_nanosleep_time64, timer_gettime64,
timer_settime64, timerfd_gettime64, timerfd_settime64, utimensat_time64,
pselect6_time64, ppoll_time64, io_pgetevents_time64, recvmmsg_time64,
mq_timedsend_time64, mq_timedreceive_time64, semtimedop_time64,
rt_sigtimedwait_time64, futex_time64, sched_rr_get_interval_time64,
pidfd_send_signal, io_uring_setup, io_uring_enter, and io_uring_register
syscalls.
* Enhanced decoding of bpf syscall.
* Wired up getegid, geteuid, getppid, io_pgetevents, statfs64, and fstatfs64
syscalls on alpha.
* Wired up kexec_file_load and migrate_pages syscalls on arm.
* Wired up io_pgetevents, perf_event_open, seccomp, and statx syscalls
on ia64.
* Wired up seccomp syscall on m68k.
* Wired up statx syscall on sh.
* Wired up pkey_mprotect, pkey_alloc, and pkey_free syscalls on alpha, hppa,
ia64, m68k, s390, s390x, sh, sparc, and sparc64.
* Wired up rseq syscall on alpha, hppa, ia64, m68k, sh, sparc, sparc64,
and xtensa.
* Wired up direct ipc syscalls on m68k, mips o32, powerpc, powerpc64,
s390, s390x, sh, sparc, sparc64, and x86.
* Updated lists of BPF_*, FAN_*, F_SEAL_*, IPV6_*, NT_*, PR_SPEC_*, SO_*,
and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.1.
Noteworthy changes in release 5.0 (2019-03-19)
==============================================
* Changes in behavior
* -D option now implies -I4: by default strace ignores SIGHUP, SIGINT,
SIGQUIT, SIGPIPE, SIGTERM, SIGTTIN, SIGTTOU, and SIGTSTP when -D option
is used.
* Diagnostic message is no longer printed if an attempt to restart a process
has failed with ESRCH. (Addresses RHBZ bug #1662936.)
* ASCII dump no longer tries to read the whole buffer at once. As result,
it can fail with a diagnostic message after dumping only a part.
Amount of preceding zeroes printed for offset is now chosen in a way
to accommodate all the digits of all the offsets being printed.
* Improvements
* Changed the way tracees are handled: all pending tracees are now waited for
before further processing, this improves fairness of tracee processing.
(Addresses RHBZ bugs #478419, #526740, #851457, #1609318, #1610774,
and maybe some others.)
* Enhanced xlat styles support configured by -X option.
* Enhanced decoding of bpf syscall.
* Enhanced decoding of PTRACE_PEEKUSER and PTRACE_POKEUSER on hppa.
* Enhanced pid formatting in strace-log-merge output.
* Wired up kexec_file_load and rseq syscalls on aarch64, arc, metag, nios2,
or1k, riscv, and tile architectures.
* Updated lists of BPF_*, BTRFS_*, FAN_*, IFLA_*, KERN_*, KVM_CAP_*, NDA_*,
NETNSA_*, NT_*, PR_*, REL_*, SECCOMP_*, SCTP_*, UDP_*, V4L2_*, and *_MAGIC
constants.
* Updated lists of ioctl commands from Linux 5.0.
* Bug fixes
* Fixed ordering of sockaddr_in6 fields.
* Fixed strace-k test on alpha.
* Fixed build on mips o32.
* Fixed build on NOMMU architectures.
* Fixed build in --with-libiberty=yes mode.
* Fixed potential NULL dereference during printing of line continuation
for syscalls that haven't been decoded.
* Fixed strace-log-merge error diagnostics.
Noteworthy changes in release 4.26 (2018-12-26)
===============================================
* License
* The test suite is now provided under the terms of
the GNU General Public License version 2 or later.
* All the rest of strace is now provided under the terms of
the GNU Lesser General Public License version 2.1 or later.
* Changes in behavior
* If strace is interrupted by a signal it handles (currently
one of HUP, INT, QUIT, PIPE, or TERM), strace terminates
itself with this signal.
* Improvements
* Implemented obtainment of system call information using
PTRACE_GET_SYSCALL_INFO ptrace API.
* Implemented decoding of PTRACE_GET_SYSCALL_INFO ptrace request.
* Implemented decoding of BLKGETZONESZ, BLKGETNRZONES, and RND* ioctl
commands.
* Enhanced xlat styles support configured by -X option.
* Enhanced internet address formatting in structureless contexts.
* Enhanced decoding of getsockopt SO_ERROR option.
* Enhanced error diagnostics when the first exec fails.
* Added %net as a short form of %network in syscall specifications.
* Updated lists of ABS_*, BPF_*, FAN_*, IFA_*, IFLA_*, KVM_CAP_*, NETLINK_*,
NTF_*, PR_SPEC_*, REL_*, SOL_*, TCA_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 4.20.
* Enhanced manual page.
* Bug fixes
* Fixed "xlat_idx: Unexpected xlat value 0" warnings.
* Fixed sthyi output format on s390.
* Documented -X option in strace -h output.
Noteworthy changes in release 4.25 (2018-10-30)
===============================================
* Improvements
* Implemented decoding of KVM_CHECK_EXTENSION and NBD_* ioctl commands.
* Implemented decoding of SOL_XDP socket option names.
* Implemented decoding of AF_PACKET protocols in socket syscall.
* Implemented decoding of AF_AX25 and AF_X25 addresses, protocols,
and options.
* Implemented stack trace printing on receiving signals.
* Enhanced xlat styles support configured by -X option.
* Enhanced decoding of IFLA_*, NETCONFA_*, and SMC_DIAG_* netlink attributes.
* Wired up io_pgetevents syscall on arm, sparc, and sparc64.
* Updated lists of AF_*, AUDIT_*, BPF_*, IFLA_*, IN_*, IPSTATS_*,
IPV4_DEVCONF_*, NT_*, SCTP_*, SO_*, SOCK_*, SOL_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 4.19.
* Bug fixes
* Fixed decoding of bit sets in evdev ioctl commands.
* Fixed decoding of EVIOCGBIT(0, ...) ioctl commands.
* Fixed test suite for the case when mlockall and unimplemented syscalls
are explicitly disabled by a seccomp filter.
Noteworthy changes in release 4.24 (2018-08-14)
===============================================
* Improvements
* Implemented decoding of kvm vcpu exit reason (-e kvm=vcpu option),
requires Linux kernel version 4.16.0 or higher.
* Implemented decoding of KVM_SET_CPUID2 and KVM_GET_*_CPUID ioctl commands.
* Enhanced decoding of corner cases of SO_LINGER, SO_PEERCRED,
and PACKET_STATISTICS getsockopt options.
* Wired up io_pgetevents and rseq syscalls on hppa, microblaze, mips, powerpc,
and s390.
* Updated lists of AUDIT_*, BPF_*, IFA_*, IFLA_*, RTA_*, RTPROT_*, TCP_*,
TRAP_*, and UDP_* constants.
* Updated lists of ioctl commands from Linux 4.18.
* Bug fixes
* Fixed decoding of Q_XGETQSTAT on non-native personalities.
* Fixed race condition in aio test.
* Fixed build with Bionic libc.
* Fixed build with glibc-2.28.
* Fixed build in exotic systemd-nspawn based environments.
* Fixed build on s390 with kernel headers that do not contain Linux commit
v3.10-rc1~201^2~11.
Noteworthy changes in release 4.23 (2018-06-14)
===============================================
* Changes in behaviour
* On x32 personality, 64-bit syscalls (such as readv) are now shown with "#64"
suffix instead of "64:" prefix. Unlike the old names, these new names
can be used in syscall qualification expressions.
* Changed error number output format: error numbers are consistently
printed as "-1 ECONST (Error description)"
for known errors and as "-1 (errno 123)" for unknown errors,
regardless of -e raw qualification settings. One can specify
-X raw for displaying raw error numbers unconditionally.
* Unfetchable addresses inside arrays are now printed as comments.
* Obsolete IA-32 mode syscall names are no longer printed on ia64.
* Improvements
* Implemented libdw backend for -k option, configured at build time
using --with-libdw option.
Whether -k option is compiled is now configured at build time
using --enable-stacktrace option.
* Added -X option for configuring xlat output formatting (addresses
Debian bug #692915).
* Added support for personality designation ("64", "32", or "x32") to syscall
qualifications in -e trace expressions.
* Implemented injection of syscalls with no side effects as an alternative
to injection of an invalid syscall (-e inject=SET:syscall= expression).
* Improved support for reproducible builds (addresses Debian bug #896016).
* Implemented decoding of BPF_PROG_QUERY and BPF_RAW_TRACEPOINT_OPEN bpf
syscall commands.
* Implemented decoding of INOTIFY_IOC_SETNEXTWD and PERF_EVENT_IOC_* ioctl
commands.
* Implemented decoding of PR_GET_SPECULATION_CTRL and PR_SET_SPECULATION_CTRL
prctl syscall options.
* Enhanced decoding of bpf, getsockopt, setsockopt, and socket syscalls.
* Enhanced decoding of NETLINK_KOBJECT_UEVENT and NETLINK_ROUTE protocols.
* Enhanced decoding of *_DIAG_MEMINFO netlink attributes.
* Enhanced decoding of BTRFS_*, FS_IOC_*, SIOCGIFHWADDR, and SIOCSIFHWADDR
ioctl commands.
* Enhanced decoding of AF_BLUETOOTH socket addresses.
* Implemented decoding of io_pgetevent syscall.
* Wired up rseq syscall.
* Updated lists of ADJ_*, BPF_*, BPF_F_*, BPF_PROG_TYPE_*, ETH_P_*, FPE_*,
IFF_*, IPPROTO_*, MAP_*, MS_*, MSG_*, NETLINK_*, PACKET_*, PROT_*, SCTP_*,
SECCOMP_FILTER_FLAG_*, SEGV_*, SEM_*, SHM_*, SW_*, V4L2_CID_*,
V4L2_CTRL_CLASS_*, and V4L2_PIX_FMT_* constants.
* Updated lists of ioctl commands from Linux 4.17.
* Bug fixes
* Fixed decoding of msgtyp argument of msgrcv syscall.
* Fixed fallback definitions for F_*, MCL_*, MSG_ZEROCOPY, SI_*,
and SOL_SOCKET constants.
* Fixed -e trace=%pure expression on mips.
Noteworthy changes in release 4.22 (2018-04-05)
===============================================
* Changes in infrastructure
* The mailing list was moved to [email protected].
* SourceForge git repository
(https://sourceforge.net/p/strace/code/ci/master/tree/) is no longer
maintained. Please use GitLab (https://gitlab.com/strace/strace/)
or GitHub (https://github.com/strace/strace/) repository instead.
* Changes in behaviour
* When printing string data, '8' and '9' following an octal escape sequence
no longer lead to unabbreviated octal escape sequence output, as they used
to do.
* Angle brackets are now printed as octal number escape sequences
in the output of paths associated with file descriptors.
* Data dump for write syscalls (-e write) is performed regardless
of successfulness of these syscall (addresses Debian bug #436284).
* -r and -t options are now affect output independently. Previously,
-r option led to ignoring of the -t option (addresses Debian bug #466195).
* Improvements
* Implemented delay injection (-e inject=SET:delay_enter= and
-e inject=SET:delay_exit= options).
* Added -A option for opening output files in append mode
(addresses Debian bug #528488).
* IPv6 addresses shown in socket information in -yy mode are now printed
in brackets.
* Enhanced decoding of bpf, prctl and ptrace syscalls.
* Enhanced decoding of BTRFS_IOC_INO_PATHS, BTRFS_IOC_LOGICAL_INO, and PTP_*
ioctl commands.
* Enhanced NETLINK_ROUTE protocol decoding.
* Updated lists of signal codes.
* Updated lists of BPF_*, BTN_*, ETH_P_*, INET_DIAG_BC_*, KEY_*, POLL*, RWF_*,
SCHED_FLAG_*, SCTP_* and error constants.
* Implemented block/character device number printing in -yy mode.
* Known pixel/SDR format names are printed as comments for pixelformat fields
in v4l2 structures.
* Enhanced decoding of kern_features syscall.
* Enhanced NETLINK_NETFILTER netlink protocol decoder.
* Optimized handling of large number of tracees.
* Improved wall clock time measurement in syscall count statistics
(-c -w option).
* Extended the range of allowed values in -e inject=...:retval= expression.
* Added i18n support.
* Updated lists of ioctl commands from Linux 4.16.
* Enhanced manual page.
* Bug fixes
* Fixed build on m68k.
* Fixed v4l2 pixelformat decoding on big-endian architectures.
* Fixed -O option.
Noteworthy changes in release 4.21 (2018-02-13)
===============================================
* Changes in behaviour
* Warning is now issued when -F option is used.
* Warning is now issued when a tracee with unsupported personality
is attached.
* Unknown syscall numbers are now printed in hexadecimal form.
* Improvements
* Implemented decoding of netlink descriptor attributes as file descriptors.
* Implemented decoding of hugetlb page size selection flags.
* Implemented decoding of BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID,
BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID,
and BPF_OBJ_GET_INFO_BY_FD commands of bpf syscall.
* Enhanced decoding of get_thread_area, memfd_create, modify_ldt,
perf_event_open, reboot, s390_guarded_storage, s390_pcio_mmio_read,
s390_pci_mmio_write, s390_runtime_instr, s390_sthyi, set_thread_area,
and shmget syscalls.
* Implemented decoding of KVM_* and DM_LIST_DEVICES ioctl commands.
* Implemented decoding of riscv_flush_icache syscall.
* Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
level.
* Enhanced decoding of BPF_MAP_CREATE command of bpf syscall.
* Print values returned by mq_open syscall and first arguments
of mq_getsetattr, mq_notify, mq_timedreceive, and mq_timedsend syscalls
as file descriptors.
* Added decoding of get_tls syscall on arm.
* Added -e trace=%pure option for tracing system calls with no arguments that
never fail.
* Updated lists of IPV6_*, MAP_*, MEMBARRIER_CMD_*, MSG_*, NT_*, PKEY_*,
SHM_*, and TCP_* constants.
* Added manual page for the strace-log-merge command.
* Updated lists of ioctl commands from Linux 4.15.
* Implemented biarch support for s390x.
* Implemented an optional support for symbol demangling in strace -k output
(activated by --with-libiberty configure option).
* Information about availability of demangling and reliable personality
decoding (on architectures with multiple personalities) is now available
in strace -V output.
* Added decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls on
powerpc and powerpc64.
* Enhanced manual page.
* Bug fixes
* Fixed multi-personality support in cross builds.
* Added mq_getsetattr, mq_notify, mq_open, mq_timedreceive, and mq_timedsend
syscalls to %desc tracing set.
* Fixed path tracing support for mmap syscalls with indirect arguments and
for old select syscall.
* Fixed decoding of arm-specific (__ARM_NR_*) syscalls.
* Fixed open mode flags decoding.
* Fixed corner cases in handling of strace -ff -ttt logs by strace-log-merge.
* Error counts that exceed one billion are now printed correctly in call
summary output.
* Fixed call summary header for x32 personality.
* Changes of tracee personalities are reported more reliably.
* Fixed the case when strace attaches to a tracee being inside exec and its
first syscall stop is syscall-exit-stop instead of syscall-enter-stop,
which messed up all the syscall state tracking.
* Fixed printing of higher 32 bits of the return value for x32 personality.
* Portability
* A C compiler that supports "for" loop initial declarations is now required.
* Inability to configure multiple personality support on architectures where
multiple personalities are supported leads to configuration failure during
build now. Use --enable-mpers=check to revert to the old behaviour.
* Build-time requirement for the mpers support has been lowered from gawk 4
to gawk 3.
* Removed incomplete and non-functional support for the CRIS architecture.
* Removed incomplete and unused support for IA-32 mode on the IA-64
architecture.
Noteworthy changes in release 4.20 (2017-11-13)
===============================================